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Rough idle in drive , not in park

Joined
Feb 13, 2020
Messages
10
Location
oklahoma
Corvette
1988 corvette coupe
Had a blown head gasket, bad driver heads , mechanic fixed and resealed the engine with all new gaskets , new water pump , hoses ect 4000 to fix, mechanics had it for 2 months trying to figure out why it idles rough drive, slight rough idle in park since the reseal of the engine. Replaced egr, fuel injectors , currently relooking at the Valves. Anyone experienced this? It didn’t idle rough before it was worked on.
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
Do a compression test and a leakage test. That will help you determine if the problem is valve-related.
 

compyelc4

Well-known member
Joined
May 1, 2002
Messages
609
Location
Dayton, Ohio
Corvette
'95 LT1 Coupe, Comp Yell; C6 Roadster, Vel Yell
Had a blown head gasket, bad driver heads , mechanic fixed and resealed the engine with all new gaskets , new water pump , hoses ect 4000 to fix, mechanics had it for 2 months trying to figure out why it idles rough drive, slight rough idle in park since the reseal of the engine. Replaced egr, fuel injectors , currently relooking at the Valves. Anyone experienced this? It didn’t idle rough before it was worked on.
Check motor mounts?
 

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